A sneaky fan managed to film the moment and Adele has spoken to DJ Zane Lowe on Beats 1 Radio about her new material and revealed the track is about her boyfriend.

Adele spotted leaving her concert at Radio City Music Hall (Image: XPOSUREPHOTOS.COM)

Talking about writing new material, she said: "I feel like with my other albums, because I was so candid and honest in my interviews and so specific about the actually incident or event, I didn't really think about everyone else and I hurt people's feelings doing that."

She attempted to write about her son Angelo with long-term partner Simon Konecki and other people's experiences instead but admits the material was boring and her boyfriend told her to "own it".

Adele and partner Simon Konecki (Image: Getty)

"He was like, 'This is your think, like own it, do whatever you want'. Not that I've written any songs about any exes, there are a few songs about our relationship, but the actual true meaning behind them is how like brilliant we are and how much of a team we are.

"Water Under The Bridge is more like, I'm waiting for him to be horrible but I don't think he's gonna be, waiting for the relationship to end. This is the relationship now that I'm gonna be in. It was quite a ground-breaking moment."

The full interview with Adele will air on Beats 1 with Zane Lowe at 5pm.